GEOLOGY

Detailed explanation-1: -Tectonic hazards are earthquakes and volcanic eruptions. Also included. under the heading are secondary hazards, such as tsunamis. Plate boundaries are recognised by plate tectonic theory as being of three types: Convergent (destructive): occur where two tectonic plates are moving together.

Detailed explanation-2: -A volcanic hazard refers to any potentially dangerous volcanic process that puts human lives, livelihoods or infrastructure at risk of harm. Several hazards may affect the area around the volcano, such as lava flows, pyroclastic flows, lahars, jökulhlaups and landslides or debris avalanches.

Detailed explanation-3: -Volcanoes are classified as active, dormant, or extinct. Active volcanoes have a recent history of eruptions; they are likely to erupt again. Dormant volcanoes have not erupted for a very long time but may erupt at a future time.

Detailed explanation-4: -Tectonic hazards include earthquakes and volcanic eruptions, as well as secondary hazards such as tsunamis. These represent a significant risk in some parts of the world in terms of loss of life, livelihoods and economic impact.